function showDiv(divname)
{
	
var Idiv     = document.getElementById(divname);

// var mou_head = document.getElementById('mou_head');

Idiv.style.display = "block";
//以下部分要将弹出层居中显示
// Idiv.style.left=(document.documentElement.clientWidth-Idiv.clientWidth)/2+document.documentElement.scrollLeft+"px";
// Idiv.style.top =(document.documentElement.clientHeight-Idiv.clientHeight)/2+document.documentElement.scrollTop-50+"px";
//以下部分使整个页面至灰不可点击
var procbg = document.createElement("div"); //首先创建一个div
procbg.setAttribute("id","mybg"); //定义该div的id
procbg.style.background = "#000000";
procbg.style.width = "100%";
procbg.style.height = "100%";
procbg.style.position = "fixed";
procbg.style.top = "0";
procbg.style.left = "0";
procbg.style.zIndex = "500";
procbg.style.opacity = "0.6";
procbg.style.filter = "Alpha(opacity=70)";
//背景层加入页面
document.body.appendChild(procbg);
// document.body.style.overflow = "hidden"; //取消滚动条
 
//以下部分实现弹出层的拖拽效果
// var posX;
// var posY;
// mou_head.onmousedown=function(e)
// {
// if(!e) e = window.event; //IE
// posX = e.clientX - parseInt(Idiv.style.left);
// posY = e.clientY - parseInt(Idiv.style.top);
// document.onmousemove = mousemove;
// }
// document.onmouseup = function()
// {
// document.onmousemove = null;
// }
// function mousemove(ev)
// {
// if(ev==null) ev = window.event;//IE
// Idiv.style.left = (ev.clientX - posX) + "px";
// Idiv.style.top = (ev.clientY - posY) + "px";
// }
}


function closeDiv(divname) //关闭弹出层
{
	
var Idiv=document.getElementById(divname);
Idiv.style.display="none";
document.body.style.overflow = "auto"; //恢复页面滚动条
var body = document.getElementsByTagName("body");
var mybg = document.getElementById("mybg");
body[0].removeChild(mybg);
}